Noah Webster's Dictionary 1. (a.) Returning with the year, at a stated time; annual; yearly; as, an anniversary feast. 2. (n.) The annual return of the day on which any notable event took place, or is wont to be celebrated; as, the anniversary of the Declaration of Independence. 3. (n.) The day on which Mass is said yearly for the soul of a deceased person; the commemoration of some sacred event, as the dedication of a church or the consecration of a pope. 4. (n.) The celebration which takes place on an anniversary day.

Multi-Version Concordance Anniversary (1 Occurrence) Deuteronomy 16:6 but at the place which Yahweh your God shall choose, to cause his name to dwell in, there you shall sacrifice the Passover at even, at the going down of the sun, at the season that you came forth out of Egypt. (See NIV)